| 摘要 |
PURPOSE:To make a delay medium small-sized and reduce the production cost, by sticking a pair of transducers to both ends of the hexahedral delay medium, where faces opposing each other are parallel with each other and adjacent faces form right angles, so that these transducers do not oppose each other. CONSTITUTION:Metallic electrodes 12a and 12b are formed in both end parts of a delay medium 11 which consists of glass, metals, ceramic, or the like and is formed to a hexahedron where faces opposing each other are parallel with each other and adjacent faces form right angles. A pair of transducers 13 and 14 for input and output are stuck onto these electrodes so that transducers 13 and 14 do not oppose each other. Metallic electrodes 15 and 16 are formed on these transducers 13 and 14, and lead wires 18 and 19 for input and output are attached to surfaces of electrodes 15 and 16, and lead wires 17a and 17b for earth are attached to metallic electrodes 12a and 12b. Ultrasonic waves excited by the transducer 13 for input are propagated in a propagation path 21 while being reflected plural times in the delay medium 11 and reach the output transducer 14. |
